1. Product Make-up and Structural Quality
1.1 Alumina Content and Crystal Stage Advancement
( Alumina Lining Bricks)
Alumina lining bricks are thick, engineered refractory porcelains primarily made up of aluminum oxide (Al â‚‚ O FIVE), with material usually varying from 50% to over 99%, directly affecting their efficiency in high-temperature applications.
The mechanical stamina, corrosion resistance, and refractoriness of these blocks raise with higher alumina concentration as a result of the growth of a durable microstructure controlled by the thermodynamically stable α-alumina (diamond) phase.
Throughout manufacturing, forerunner materials such as calcined bauxite, merged alumina, or synthetic alumina hydrate undergo high-temperature firing (1400 ° C– 1700 ° C), advertising phase change from transitional alumina forms (γ, δ) to α-Al â‚‚ O FOUR, which displays remarkable solidity (9 on the Mohs range) and melting point (2054 ° C).
The resulting polycrystalline structure contains interlacing diamond grains embedded in a siliceous or aluminosilicate glazed matrix, the structure and volume of which are very carefully controlled to balance thermal shock resistance and chemical toughness.
Minor ingredients such as silica (SiO TWO), titania (TiO TWO), or zirconia (ZrO TWO) might be introduced to modify sintering habits, boost densification, or enhance resistance to specific slags and changes.
1.2 Microstructure, Porosity, and Mechanical Honesty
The efficiency of alumina lining bricks is seriously based on their microstructure, specifically grain dimension circulation, pore morphology, and bonding stage features.
Optimum bricks exhibit fine, consistently distributed pores (closed porosity preferred) and minimal open porosity (
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